undefined method `protect_against_forgery?' for Xyz::Cell

[porbas]

Hi, after upgrade:
cells 4.0.0.beta2 -> 4.0.0beta6 and
cells-slim 0.0.1 -> 0.0.2

there is problem when using form_for rails helper

actionview (4.2.0) lib/action_view/helpers/url_helper.rb:607:in `token_tag'
actionview (4.2.0) lib/action_view/helpers/form_tag_helper.rb:847:in `extra_tags_for_form'
cells-slim (0.0.2) lib/cell/slim.rb:53:in `form_tag_html'
cells-slim (0.0.2) lib/cell/slim.rb:49:in `form_tag_with_body'
actionview (4.2.0) lib/action_view/helpers/form_helper.rb:448:in `form_for'
app/concepts/receiving/views/new.slim:5:in `block in singleton class'
app/concepts/receiving/views/new.slim:-1:in `instance_eval'
[...]